Most of the amateur radio digital protocols are keyboard to keyboard and don't really have the concept of simultaneous traffic, packets, and routing. AX.25 (also known as packet radio) does however and could possibly be used to transmit traffic like that. It is most frequently used on line-of-sight (VHF, UHF) bands. There are some others like the different PACTOR protocols, but they are essentially proprietary, and PACTOR IV TNCs are not cheap.